FromAsync Method (IAsyncResult, Func(IAsyncResult, TResult), TaskCreationOptions, TaskScheduler)

TaskFactory<TResult>.FromAsync Method (IAsyncResult, Func<IAsyncResult, TResult>, TaskCreationOptions, TaskScheduler)

[ This article is for Windows Phone 8 developers. If you’re developing for Windows 10, see the latest documentation. ]

Creates a task that executes an end method function when a specified IAsyncResult completes.

Namespace:  System.Threading.Tasks
Assembly:  mscorlib (in mscorlib.dll)

public Task<TResult> FromAsync(
	IAsyncResult asyncResult,
	Func<IAsyncResult, TResult> endMethod,
	TaskCreationOptions creationOptions,
	TaskScheduler scheduler
)

Parameters

asyncResult
Type: System.IAsyncResult
The IAsyncResult whose completion should trigger the processing of the endMethod.
endMethod
Type: System.Func<IAsyncResult, TResult>
The function delegate that processes the completed asyncResult.
creationOptions
Type: System.Threading.Tasks.TaskCreationOptions
One of the enumeration values that controls the behavior of the created task.
scheduler
Type: System.Threading.Tasks.TaskScheduler
The task scheduler that is used to schedule the task that executes the end method.

Return Value

Type: System.Threading.Tasks.Task<TResult>
The created task that represents the asynchronous operation.

ExceptionCondition
ArgumentNullException

The asyncResult argument is null.

-or-

The endMethod argument is null.

-or-

The scheduler argument is null.

ArgumentOutOfRangeException

The creationOptions parameter specifies an invalid value.

Windows Phone OS

Supported in: 8.1, 8.0

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